SKU: 4041-16 | UPC: GSC4041-16
GSC P-D 4G63T .035in over OEM Chromoly CNC Spring Seat for Mitsubishi Eclipse Talon Evo - Set of 16 (1990-2006)
GSC Power-Division Chromoly spring seats measure .035 inches taller than OEM for 4G63T engines in high-performance applications. They fit 1990-1999 Mitsubishi Eclipse GST GSX Spyder GST 1990-1994 Eclipse GS 1990-1998 Eagle Talon TSi 1990-1994 Plymouth Laser RS 1991-1992 Galant VR-4 and 2005-2006 Lancer Evolution models. Pairing with upgraded valve springs these seats support extreme RPM levels prevent coil bind and deliver consistent power in boosted setups.
Key Features
- Chromoly Steel Construction: 4130 Chromoly material withstands fatigue and high spring pressures in 4G63T turbocharged engines.
- CNC Machined Precision: Tight tolerances provide exact seat alignment and valvetrain geometry for reliable valve action.
- .035in Over OEM Height: Matches GSC valve spring kits to ensure proper installed height and clearance in performance builds.
- Complete Set of 16: Covers all intake and exhaust valves with uniform specs across the engine.
- Direct Bolt-On Fit: Works with OEM heads on DSM and Evo platforms without modifications.
Product Notes
- Pair with GSC valve springs to achieve peak performance and prevent retainer-to-seal contact.
- Inspect valve retainers and locks for compatibility before final assembly.
- Ships in protective foam packaging store in dry conditions.
Installation Notes
- Professional installation recommended.
- Measure installed spring height post-assembly to verify .035in offset and preload.
- Compatible with OEM or aftermarket retainers use 10-degree locks for secure retention.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1990-1998 | Eagle | Talon | TSi |
| 1990-1994 | Mitsubishi | Eclipse | GS |
| 1990-1999 | Mitsubishi | Eclipse | GST |
| 1990-1999 | Mitsubishi | Eclipse | GSX |
| 1996-1999 | Mitsubishi | Eclipse | Spyder GST |
| 1991-1992 | Mitsubishi | Galant | VR-4 |
| 2005-2006 | Mitsubishi | Lancer Evolution | All |
| 2005-2006 | Mitsubishi | Lancer Evolution MR | MR |
| 2005-2006 | Mitsubishi | Lancer Evolution RS | RS |
| 2006 | Mitsubishi | Lancer Evolution SE | SE |
| 1990-1994 | Plymouth | Laser | RS |
Why Choose GSC Power-Division?
- Proven in drag racing and time attack with 4G63T engines around the world.
- Aerospace-grade materials tested for durability beyond 10,000 RPM.
- Every part CNC-machined in-house for precise fit and consistent results.
Frequently Asked Questions
-
Q: Will these fit my 1995 Eclipse GSX with stock head?
A: Yes direct replacements for all 1990-1999 4G63T heads in Eclipse GST GSX covering 7-bolt and 6-bolt setups. -
Q: What material are the spring seats made from?
A: 4130 Chromoly steel heat-treated to handle up to 200lbs seat pressure far beyond OEM cast seats. -
Q: Do these come with a warranty and what about installation?
A: Covered by GSC lifetime defect warranty professional install recommended to check spring heights and valvetrain setup.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Foam-protected box 8in x 6in x 4in
- Weight: 1.8 lbs
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